Discussion
Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere in future?
Answer: B
Carbon dioxide from fossil fuels is the main cause of the rise in average global temperature. Burning coal, oil and gas has raised its atmospheric concentration from about 280 ppm before the industrial era to over 420 ppm today.
Ozone depletion is a separate problem: it admits more ultraviolet radiation but does not by itself warm the lower atmosphere.
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